Pacman, who told you not to put Lemon Tetras in a 10 gallon tank? They grow to be about 1.3 inches. I don't see any problem with putting a few in. In my 10 gallon I have 2 Glass Catfish (Leftovers from my 20 gallon-they were being abused by something very unsociable in my 20 gallon), 2 Albino Corys, and 1 Female Beta.
You could even put a couple of African Dwarf Frogs. They're fun to watch and they don't bother the fish.
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